title: Staphylococci producing a non-immune precipitation line with human serum.
abstract: When grown on brain heart agar plates, Staphylococcus capitis, S. warneri and S. xylosus produced a precipitation line with normal human serum in the double diffusion test. Eight other staphylococcal species did not produce this line. Of 20 strains of S. capitis, all produced the precipitation line, and the type strain of S. capitis produced the precipitation line against the sera from eight animal species. The precipitation is not caused by protein A and it is not an immune reaction because the serum component is in the albumin fraction of serum when fractionated on Sephadex G-200.
mesh_terms: D000818:Animals; D011232:Chemical Precipitation; D002850:Chromatography, Gel; D006801:Humans; D005779:Immunodiffusion; D012709:Serum Albumin / Q000276:immunology*; D013045:Species Specificity; D013210:Staphylococcus / Q000276:immunology*
chemical_list: D012709:Serum Albumin